<style type="text/css">
	#tetris {
		margin: 0 auto;
		margin-top: 50px;
		border-radius: 5px;
		box-shadow: 0 0 1px 0px rgba(0, 0, 0, 0.5);
	}
	
	@keyframes animate-cloud {
		0% {
			background-position: 600px -10%;
		}
		100% {
			background-position: 0 -10%;
		}
	}
	
	body {
		background: url(../../img/div.jpg) 0 10px repeat-x #049ec4;
		animation: animate-cloud 20s linear infinite;
		width: 100%;
		height: auto;
		margin: 0 auto;
		padding: 0;
		position: relative;
	}
</style>